A multi-platform ReactiveX implementation targetting JVM, iOS, Android, and JS.

More targets can be added upon request.

Documentation

Please refer to https://reactivex.io for documentation.

Sources

The reactivex documentation covers much of the functionality. If there are any significant discrepancies, excluding those illuminated within this documentation, please post an issue.

• Observable
• Single - Similar to observable, but will complete when the first value is emitted.
• BehaviorRelay - Subject which ignores all notifications. Relays retain and emit the latest element.
• BehaviorSubject - Similar to the BehaviorRelay, but acknowledges notifications
• PublishSubject
• More coming, new collaborators / contributions are greatly appreciated.

Operators

More operators are coming quickly, but not all have been implemented.

Currently supported operators:

• map
• filter
• flatMap
• switchMap (non-interleaving variant of FlatMap)
• combineLatest
• onErrorReturn
• toSingle
• first

Examples

Single(just = "hello")
  .map { "$it world" }
  .subscribe(NextObserver { result ->
    // result => "hello world"
  })

/* Be sure to dispose when this is no longer needed to prevent leaks. */
val disposable = Observable<String>(createWithEmitter = { emitter ->
  emitter.next("we're happy")
  emitter.next("la la la")

  Disposables.create {
    /*
     * This block is called when this cold observable loses all of its observers or
     * a notification is received. Use this to clean up any open connections, etc.
     */
  }
}).flatMap { happyText ->
  /* Use the text to maybe fetch something from an api. */
  return@flatMap Single<String>(error = UnauthorizedException()) // Uh oh, expired access
    .onErrorReturn { throwable ->
      /* Handle throwable, maybe check for unauthorized and recover */
      return@onErrorReturn Single(just = "$happyText recovery")
    }
}.subscribe(NextTerminalObserver({ emission ->
  /*
   * emission => "we're happy recovery"
   * emission => "la la la recovery"
   */
}, { throwable ->
  /* No terminal notifications in this example */
}))

Installing

Please ensure you're using gradle 5.3+.

Installing has recently become significantly easier. Now it's as simple as including the following:

Kotlin Build Script

kotlin {
    sourceSets {
        val commonMain by getting {
            dependencies {
                api("com.noheltcj:rxcommon:0.6.1")
            }
        }
    }
}

Groovy Build Script

kotlin {
    sourceSets {
        commonMain {
            dependencies {
                api 'com.noheltcj:rxcommon:0.6.1'
            }
        }
    }
}

Kotlin Support Map (For Native)

Since native modules require dependencies to be compiled with the same kotlin version, we will be keeping up with this support map going forward.

0.4.2 -> 1.3.20
0.5.0 -> 1.3.21
0.5.1 -> 1.3.21
0.5.2 -> 1.3.30
0.5.3 -> 1.3.31
0.6.0 -> 1.3.50
0.6.1 -> 1.3.61

Objective-C Generics

Objective-c only has partial generics support, so we lose a bit of information when this library is imported as a framework in XCode.

To help with this, when you produce an Objective-C framework, be sure to enable generics support.

components.main {
    outputKinds("framework")
    extraOpts "-Xobjc-generics"
}

Concurrency

This library doesn't support concurrency. In the majority of cases, concurrency is a side effect that can be handled on the platform. If you are doing anything that requires a significant amount of time to operate, it's important to do this work off the main thread (Especially if your application has a user interface). Of course do that using other resources such as RxSwift, RxJava, or basic platform concurrency frameworks, but ensure you've returned to the main thread before re-entering the common code.